Updating a code example in the docs - classes.rst

[sameh-farouk]

the giving example for the generator expressions that yield all words from a page will actually yield all the characters from that page instead, giving that the page holds a multiline string as the name implies.

>>> page = """hello, world
... I love Python!"""
>>> set(word for line in page for word in line.split())
{'n', 'h', 'd', 'o', 'e', ',', 'r', 'I', 't', 'v', 'P', 'l', 'w', 'y', '!'}

the example could be correct only if the page variable contains a list for lines instead, but then the variable name would need to reconsider, for example, lines.

the correct code would be something like:

>>> set(word for line in page.splitlines() for word in line.split())
{'love', 'world', 'I', 'hello,', 'Python!'}

the same generator expressions also could be simplified to just

>>> set(word for word in page.split())
{'love', 'world', 'I', 'hello,', 'Python!'}

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